I should think it is a day to day thing, there could be a flood before then. You could try googling minimum or maximum water levels that effect river boats. Here is something I just found for you
A couple of things can be done: In the case of low water levels, guests (and even crew) can be taken off the ship to reduce the weight. If this is successful, the ship sails on to the next available port, and guests can typically re-board the ship.
In the case of high water levels, the options are somewhat more limited. After increasing ballast to the available load limit, there is little that can be done. In the past, several river cruise lines have had success in offloading guests from one ship and bussing them to the next available ship that the company has along the waterway (remember: There are likely people stuck on the other side of the bridge or lock you’re waiting to traverse).
In some cases, the cruise line will spring for hotels and operate the rest of the tour as a land-based bus tour. It’s not ideal, but it allows you to salvage your vacation in the best way possible.
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A couple of things can be done: In the case of low water levels, guests (and even crew) can be taken off the ship to reduce the weight. If this is successful, the ship sails on to the next available port, and guests can typically re-board the ship.
In the case of high water levels, the options are somewhat more limited. After increasing ballast to the available load limit, there is little that can be done. In the past, several river cruise lines have had success in offloading guests from one ship and bussing them to the next available ship that the company has along the waterway (remember: There are likely people stuck on the other side of the bridge or lock you’re waiting to traverse).
In some cases, the cruise line will spring for hotels and operate the rest of the tour as a land-based bus tour. It’s not ideal, but it allows you to salvage your vacation in the best way possible.